Some jobs, such as regional graphics designers’ at NBCU, were obsolesced by new technology. Other cuts have come from units that were once sexy but are now less so compared with shiny, new digital products….The companies won’t say how many employees they are hiring for new digital ventures, such as broadband sites and mobile channels, but their job listings tell the story. Online help-wanted boards for MTVN and NBCU are filled with openings for digital operations: multimedia Web designers and programmers; Website monitors and producers; digital-ad-sales analysts; Flash illustrators; CG animators and mobile marketers.